Riddles time

What goes up up up but never grows?

Combine like terms to make a simpler expression 3z+z

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.